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Siacoin blockchain directory

July 14, 2017
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For reference, if you are on OSX, the working directory for Siacoin is ~/Library/Application Support/Sia-UI For Windows, its under C:\Users\<username>\AppData\Roaming\Sia-UI What’s the current blocksize? It’s just under 6Gb.
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Wellington Blockchain Meetup July 2017

July 12, 2017
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Just under 70 people turned out on a cold winters night at Bizdojo to the Wellington blockchain meetup on Wednesday night. It was the meetup’s biggest turn out to date. This month was a little different with Mark Pascall giving a detailed talk on “A beginners guide to wallets, buying bitcoin/ether and trading tokens”. Stephen Nicholas chipped in around taxation as well. It was just under 90 minutes covering all sorts of topics ranging from the different types of cryptocurrency wallets, to exchanges, tokens and ICOs. There were great questions and also valuable contributions from audience members. In particular, beware of scammers that buy domain names with slightly different spelling to legitimate exchanges and ask for users private keys. Thanks to BizDojo and BlockchainLabs once again!
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So you wanna put Chinese pork on the blockchain?

July 6, 2017
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When I see headlines like Walmart and IBM Are Partnering to Put Chinese Pork on a Blockchain I’m thinking, sorry, but how do you put Chinese pork on the blockchain? And it’s not just limited to food. Electronic Medical Records on the Blockchain is big news also. Let’s now add to the confusion and track beef with a cryptocurrency instead of a blockchain. Russia Gets First Sanctioned Cryptocurrency – And It’s Tracking Beef What does all this mean? Studying the blockchain has led me to understand that small bits of information can be included in a transaction. Think of it like adding a custom message when sending a small amount of, in this case, bitcoins. This article will first look at how one can add a custom message on the blockchain, specifically the bitcoin blockchain, and then figure out how it relates to Chinese pork. OP_RETURN The first thing to understand is that a blockchain is made of blocks and blocks are made of transactions. This is what a transaction looks like. In hex: Expanded it looks like this: Inside a transaction there are fields called op codes that are used to put rules in place to determine who can […]
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Bitcoin Vanity Addresses

June 29, 2017
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Introduction These have been around for a long time now but they are still nonetheless pretty neat. They are called vanity addresses because you can create a bitcoin address with certain starting letters that spell out words such as your name or your brand. What does a bitcoin address look like? A bitcoin address is like a bank number. You give it or show it to people who then use it to send you bitcoins, litecoins, ether or whatever crypto currency you prefer. Wallets create these addresses randomly and a sample bitcoin address looks like this: mr4WeSWGzg8ND2qbpvKJqq2LgMq3HfB6EW This is an address from testnet, which is a test blockchain for development. You can see the transaction history at: https://tbtc.blockr.io/address/info/mr4WeSWGzg8ND2qbpvKJqq2LgMq3HfB6EW which shows that 0.2btc has been sent to this address. Again, the 0.2 btc are not real so not worth anything. What does a bitcoin vanity address look like? For those who want to get fancy, they can create addresses such as: 1appleWGzg8ND2qbpvKJqq2LgMq3HfB6EW or 1microsoft8ND2qbpvKJqq2LgMq3HfB6EW It makes the address stand out and a little unique hence the name vanity addresses. Things to consider Generating vanity addresses with more than 7 letters can take years. This is because the computer goes through all the […]
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Bitcoin hanging at the “done loading” screen?

June 28, 2017
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If you are trying to run bitcoin core (download from here) and you see it hanging on this screen … hold tight. It takes time to load. If you are impatient like me, open up the debug.log file and you’ll see the activity behind the scenes which might make you feel better. By the way, the blockchain is 140Gb and counting.
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Bitcoin Exchanges in NZ

June 27, 2017
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Here is a neat site that list some, if not all of the bitcoin exchanges in New Zealand. https://www.bitcoinexchange.co.nz There are a handful of proper exchanges. The others are either shut down or use Localbitcoins under the hood.
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Mega Bancor Review

June 20, 2017
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Here is a great detailed write up on Bancor and what they do. Also make note to read the discussions below as well as other points of views are given. http://hackingdistributed.com/2017/06/19/bancor-is-flawed/  
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Wellington Blockchain Meetup June 2017

June 15, 2017
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The June Wellington Blockchain meetup was held last night at BizDojo with a great turn out of about 55 people. What was interesting was that about 40 of them were first timers which was amazing to see.   Mark (organizer NZ blockchain conference) kicked things off with a summary of the event and noted that slides and videos are slowly being updated on www.theblockchain.nz website so keep checking there. Klaus also shared some ICO and smart contract work that he has been doing. It was valuable to hear of actual hands on experience with ICOs. Next, James, a Wellington Blockchain stalwart who’s been to almost every one since the beginning shared his blockchain reading list with the rest of the group which was very useful. Reading a proper book beats reading 100 blog posts hands down because a story is fully developed instead of getting piece wise information. Paul contributed by announcing an idea of an informal meetup over a drink after work in between these formal monthly meetups which was a great idea. Instead of meeting only 12 times a year, it’s 24 now! Keep an eye out for the next announcement for this informal meetup. Finally Sean moderated […]
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The Killer App: Engineering the Properties of Money

June 11, 2017
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Andreas keynoting at the NZ Blockchain Conference on the 8th of May 2017. Fundamental concepts: MoE, SoV and UoA. Medium of Exchange, Store of Value and Unit of Accounting. Watch on!
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Wellington Blockchain Meetup June 2017 Announced

June 7, 2017
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The next Wellington Blockchain meet up will be on 15th June 2017 at Bizdojo. It looks like with the price of various crypto currencies on the rise, the inevitable discussion around trading cannot be ignored. We’ll be starting to talk more about the basics of trading, how to buy crypto currencies more and more over the coming months. Check out the link below for further details.   Wellington Blockchain Meetup Thursday, Jun 15, 2017, 5:30 PM Bizdojo115 Tory Street Wellington, NZ 50 Members Attending Hey guys,Let’s get together to chat about bitcoins, blockchains and smart contracts. It doesn’t matter what your background is. If you are interested and what to learn more, have questions that you want answered or want to meet with others in this industry then come along. All welcome.In this meet up (in the S-Zone with the bean bags):5:30 pm: W… Check out this Meetup →
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Downloading 122MB of the bitcoin blockchain

June 1, 2017
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Apparently it will take just over 1 year for me to download the entire bitcoin blockchain! I certainly hope not. Let’s wait and see.
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STEM, Blockchains and Collaboration

May 29, 2017
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The Hutt Valley STEM Festival was part of NZ tech week and I was asked to participate to talk on Technology and the New World of Work. There were 4 speakers in total. Gary talking about the importance of collaboration and communications. I talked about the importance of learning STEM, blockchains and how collaboration helped me with my “Ubering Energy on the Blockchain” project. Malcom talked about a sprout device which is this amazing device that allows not only 3d modelling, but changes the way we interact with computers. Gordan, the local 3d printing expert talked about how 3d printers work with tips for those going down the 3d printing path. The kids loved watching the 3d printer in action. Gordon in action speaking about 3d printing. Sean’s household electricity distribution board connected to a raspberry pi and a mac. It measures electricity consumption and displays it on a webpage. STEM, Blockchains and Collaboration presentation at the Dowse Art Museum.  
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Blockchain in Health Presentation

May 26, 2017
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I had the opportunity to present at the Emerging Tech in Health Symposium 2017 on the 24th of May at the Wellington Westpac Trust Stadium to an audience of 180 health and medical professionals along with IT mangers of health firms. It was organised by Health Informatics New Zealand (HiNZ) and New Zealand Health IT (NZHIT). Here is a list of all the Emerging Tech In Health Speakers. The focus was on looking forward to see what healthcare would look like 10 years down the track. Some of the concepts were mind blowing. Health care is going to radically change with technologies such as virtual/augmented reality, monitoring patients with devices that measure and record your every movement and with Nadia, a virtual avatar. Basically everything thing you’ve seen in sci-fi movies, will practically come true. I spoke briefly about what the blockchain is, some of the properties it has and attempted to help the audience understand blockchain related health articles a bit more. Some other highlights included a future with these control centers in hospitals that make it look like the floor of the New York Stock Exchange or mission control in Houston. 3D printing medication! And project Emma which […]
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NZ Blockchain Conference 2017 Summary

May 18, 2017
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This years blockchain conference was brilliant and engaging and will be remembered (at least for me) for the 2 keynote speakers, Andreas Antonopoulos and Vitalik Buterin who came to New Zealand and imparted their knowledge and engaged with the people of New Zealand. It started on Sunday the 7th of May where an Auckland harbor cruise was organized and some of the speakers made it. Afterwards, we all headed down to Monsoon Poon for drinks, dinner and more socializing. The conference started on Monday and all the speakers were great but a few speakers stood out for me. Pamela Morgan’s talk on bitcoin was full of energy talking about the legal aspects of bitcoin and also the need to be able to secure it properly with multi-party signatures. She is a lawyer with an inner geek streak that uses Ubuntu as her OS of choice. Now that is impressive! The other highlight was of course Andreas Antonopoulos. His talk was as always of high quality, thought provoking and to the point. He has this incredible knack for creating these superb analogies to explain various concepts. One of the best parts was in the panel discussion where he addressed a comment […]
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Day 2 recap of Blockchain NZ Conference #TBCNZ17

May 9, 2017
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Day 2 of the conference started with Christoph Jentzsch from Slock.it talking about “How companies can exist with only computer code and the story of ‘The DAO’.” It was amazing to be able to meet the person who “authored” the DAO. Margaux Avedisian was next talking about a “Beginners Guide to raising money via ICO’s (Initial Coin Offerings)” and “How to plan and execute a successful crowdsale”. It was very insightful and very interesting. The main takeaway I got was that you have to know your stuff if you’re asking for money. If you don’t, you will be found out. Jake Vartanian then talked about “Crowdsale Design, Marketing, and Community.” He had the most powerful and emotional start to his presentation when he talked about his experience meeting a kid who wanted $125 to start up an ice cream stand on his travels in South East Asia. He ended up giving the kid the money and kept in touch ever since. There was a panel discussion after that taking questions from the audience. After morning tea Graham Anderson & Mital Kayaiya from Webjet Australia shared their experience with what they are doing with blockchains. Maksim Izmaylov from Travel Tech Con […]
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Day 1 recap of Blockchain NZ Conference #TBCNZ17

May 8, 2017
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The day started off with a welcome from Minister Jacqui Dean. Then Vic Crone from Callaghan Innovation talked briefly about their involvement. Mark Pascall from 3 Months then gave a great talk on “How to explain explain blockchain at a dinner party, without boring the pants of everyone”. It was interesting and humorous as well with notes such as don’t bring a laptop and a projector to a dinner party! Paul Salisbury from 3 Months then gave a blockchain 102 and laid the foundation of how blockchain works and some of the details under the hood which was important. He has a very clear and calm voice which drew the audience in and kept their attention. Then came Pamela Morgan from Third Key Solutions talking about bitcoins, blockchains and smart contracts from lawyers. If Mark brought the humour and Paul bought the voice, Pamela bought the energy! She is a geeky lawyer and was certainly passionate in her message. After morning tea, Stephen Macaskill, president of the blockchain association of New Zealand talked about why bitcoin matters and the history of money. Stephen also has a calming voice and thinks the word crypto will become synonymous to great or amazing. […]
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The Blockchain NZ Conference kicks off at the Westhaven Pier in a few hours

May 6, 2017
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It’s Sunday and the most anticipated blockchain event in New Zealand will start tomorrow but festive activities are actually starting today with a harbour cruise. There is a special pre-blockchain harbour cruise at 12:30pm today from Westhaven Z pier. Check here for more info. After this, at 6pm there is a pre-conference function at the Viaduct/Moonsoon Poon. Andreas Antonopoulos will be the keynote speaker on Monday and Vitalik Buterin providing the closing keynote on Tuesday. Check out the blockchain NZ conference site for details on speakers and the agenda. It’s gonna be huge. See you all there.
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A Webpage for Selling Energy to your Neighbour

May 4, 2017
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It may seem like not a big deal but it’s the little things that count. I decided to build a simple webpage that displayed the same figures that could be seen on the command line but there was just something about the familiarity with seeing a webpage versus seeing a terminal screen.   As you can see the values are the same but it added a bit more work. It was worthwhile though. The trick with getting a webpage to talk to the blockchain and display the information is to use javascript to create a connection to testrpc on port 8545 in this case and to contract address and update this each time you deploy the contract. The source code is available at https://github.com/seandotau/mpower where it should be self explanatory if you have some basic javascript skills.
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US debt in pictures

May 2, 2017
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Some very big numbers: http://demonocracy.info/infographics/usa/us_debt/us_debt.html This is why we need bitcoins! With money you just keep printing more of it!
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BANZ AGM, Ubering Energy and what sharing does

April 28, 2017
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I was invited to Auckland to share my “Ubering Energy on the Blockchain” talk at the GridAkl (“Auckland’s Innovation Precinct”) a few days ago and it neatly tied into the first Blockchain Association of New Zealand (BANZ) AGM. It was wonderful to meet all these people from different backgrounds all contributing to this new technology. The vibe is certainly different to that of Wellington. It was fascinating to learn more about what NZTech does, the blockchain research projects from AUT and some exciting energy projects that others are doing as well. The next few months is certainly going to be very interesting. BANZ is gaining momentum and there are plans in place to grow the awareness and to continue the concerted efforts to see where this technology can go in all sorts of industries. The Blockchain Conference at the start of May is going to be huge with some amazing speakers. The big challenge I see is to continue this momentum. It’s been 8 years since bitcoin was invented. The 10 minute heartbeat that started this avalanche of innovation and paradigm shift has never stopped beating. Yet the resistance is still there and for all sorts of reasons. I’ve been […]
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